03 YZ250 lacking top end power?

Derick5
Posts
50
Joined
9/22/2014
Location
NY US
Edited Date/Time 11/11/2014 9:54am
I recently bought a 2003 YZ250. Runs strong, starts first kick almost everytime. Bike has a full PC Exhaust. (Platinum 2 w/304 Shorty). Gearing is 13/48. The throttle response is very good, better than my 05 YZ125.

Anyhow, I have a question. The bike pulls really good in the low end, in the mid range but the top end is pretty flat compared to my 2006 RM250 which had a FMF Gnarly w/ Shorty.

Every review I've read is that the 03 motor was really good, and have a broad powerband. I will upload a video by the end of tonight or tomorrow evening. Any suggestions? Winter is getting close, so riding is limited in my area right now!
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Deetsmx
Posts
880
Joined
4/21/2008
Location
Visalia, CA US
11/11/2014 7:16am
I have an 03 as well with same exhaust set up and I have the same issue. I was contemplating swapping the shorty for a longer silencer to see if that would help.
RyanLester761
Posts
1133
Joined
2/7/2007
Location
El Dorado Hills, CA US
11/11/2014 9:54am
Maybe the power valve isn't opening all the way? I believe these have the boost exhaust ports too so maybe there is an issue there.

Or, does the bike smoke a ton like the right side seal is bad? That will cause a rich-like running condition in the top end and won't rev out cleanly.

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